A new type of mine-used GEPON system based on optical port expander

In view of problems of low flexibility and limited access numbers of optical network terminal when mine-used GEPON system is expanded, a new type of mine-used GEPON system based on optical port expander was proposed. Principle, constitution and application of optical port expander and sub-ring optical fiber splitter were introduced. The system can improve optical power, increase node number, extend transmission distance, and derive sub-ring from any node.